Constant frequency system



une 1 19.26.

. 1,586,524 R. A. HEISING CONSTANT FREQUENCY SYSTEM Original Filed Dad. 29, 1916 /n Van for: v Raymond/1. Hols/ 1 10 frequency, which 'l fhe normal inoperative spark Pussies June 1, 1926.

UNITED STATES BAYIOND a. zmrsme, or mmmunn,

TRIO COMPANY, INCORPORATED, NEW YORK,

.consrmir' FREQUENCY sits-ran.

was; filed December 29, me, Serial-No. 139,588. Zenewed April 28,1024.

For they eneration of carrier frequency currents it has been previously proposed to use an arc or spark to excite an electric circuit into oscillation. I rents thus generated may be usedas carrier currents in a high frequency signaling 'system. Such a system is suitable for telegraph signaling in which it is 'not necessary to generate sustained oscillations of constant must, however, be provided a in carrier telephone systems. Previous are or spark oscillating circuits are not capable' of delivering constant frequency oscillations into an antenna or load circuit of varying impedance, as the. varying resistance in the "antenna or d circuit effects variations in the frequency of the oscillations generated.

The present invention has for an object provide an arc-excited oscillating ci'r- 29 cuit capable of supplying oscillations of a constant frequency in spite of variations which may occur in the resistance-of the load circuit. v

From a more general aspect the invention comprises generating oscillations by a principal wave generating device or oscillator and controlling the frequency .of the generated oscillations by a control generator so that theaction of any influence which tends to change the frequency of the waves produced by the principal generator, .as, for example, that of a signaling instrument, is prevented from changing the frequency of the principal oscillator.

In the arrangement herein disclosed the desired object is accomplished by employing two are oscillating circuits, one a main circuit which supplies the variable load, and the other a trigger circuit in which the resistance remains constant. A spark gap in the," ain circuit is normally inoperative, 1. e.,

the, relation of the sparking distance to the voltage across the gap is such that the voltage is insuflicient to jump the spark gap. gap in the operamain circuit is'perio'dically rendered 7 tiveby the constant frequency arc j trig'ger circuit. This is done by means of a magnetic field which blows the trigger a rc 5 acro ss the s ark gap in the maincircul t. ,;,Both arcs a ways go out afterv each cychc discharge and as only the trigger arc e'stab lishes itself again the fre uency of-thecur.-

rents in-qthe main oscillating circuit will be The oscillatory cur-.

determined by that of the trigger are. As the reslstance in the trigger circuit is constant, the trigger arc will be established at a constant frequency and consequently the current in the main oscillating circuit will havea constant frequency, particularly in view of the fact that the frequency of the trigger arc is preferably the same as .the resonant fre uency of the main oscillating circuit.

e accompanying drawing shows a.

modulatin system in which is employed a constant the invention. oscillating circuit L C -includes the normal- 1y inoperative spark or are gap 1. This osclllatlng circuit is energized. from a suitable source of current 2 w ich is-connected .in series with the impedance 3 and in shunt to the condenser G, and inductance L The sparkmg distance of gap 1 issuch that the voltages generated by the source 2, and the reactions of the impedances 3, (3,, L and L are insufficient to break down the resistance of this p. The oscillating circuit 0,, L 1 is. a apted to supply oscillations to a variable load, such as the modulating system 4. The splecific formof -modulating system herein s own forms no part of the present invention, and is only shown by way of illustration to indicate one way in which the constant frequency oscillations generatedmay be employed. It will also be apparent from what follows that any antenna system with suitable means for modulating the oscillations therein may be substituted for that shown. Furthermore, the application of this invention is not limited to modulation of oscillations existing in an antennabut may be'usedto modulate oscillations in anysuitable circuit or circuits, which modulated oscillations are thereafter to be a plied to an antenna or other signaling con uctor. The trigger oscillating. circuit C, L, includes the spark 'or arc gap{ 5, whic is normally operative. The spar aps 1 and 5 have a commoncathode 15 an sialparate anodes 16 and 17. The tri er osci ating circuit C, L ,-5 is energize cm a suitable source 0 direct current 6 7, or by means of trigger oscillating'.oircuit may from the source 2.1."

the switches 8 and 9 the be supplied The resistan the tri er oscillating circuit isconstant andyaccor' mgly the trig through the impedance coil maw messy, assrenoa 'ro wnsrmm nmc- I n. Y.,' a conronarron or NEW equency are system embodying In the drawing the -main ductivity ofthe spark gaps. This SIIPPI'BS? sion of the'arcs is aided by the magnetic field produced by the electromagnet 10. The

trigger oscillating circuitC L 5 and the mam oscillating circuit (1,, L 1 are bot-hpreferably tuned to the same carrier frequency. This insures that the currents in the main oscillating circuit will have a constant frequency which is the frequency of the trigger circuit.

The modulating circuit 4, herein' shown,

is sup lied with carrier oscillations from the mam oscillating circuit by means of the coil L inductively related to the coil, L The coil L, is included in the radiating antenna system 12. The amplitude of the carrier oscillations radiated is varied by means of the thermionic impedance 13 connected in shunt to the-coil L,,, the thermionic impedance 13 being controlled by a microphone 14 or other suitable means for producing signaling currents.

With the arrangement, herein shown, the variation in the resistance of the radiating antenna system will have no effect whatever upon the frequency of the currents generated in the main oscillating circuit 6,, L 1 as their frequency is dependent solely upon the constant frequency of the are established in the trigger circuit 0 L 5. Having described one form of the invention the novel features thereof will be defined both specifically and broadly in the appended claims.

What is claimed is:

1. In a constant frequency are system, the combination of an oscillation circuit containing a normally inoperative arc'gap, a trigger oscillation circuit containing a normally operative arc gap, means for energizing said circuits, and means for moving the are from said normally operative gap to said normally inoperative gap.

2. In a constant frequency are system, the combination of an oscillation circuit including a normally inoperative arc gap, a trigger oscillation circuit including 8. normally operative arc gap, means for energizing said circuits, each of said circuits including means for tuning said circuits to substantially the same frequency, and means for moving the are from said normally operative gap to said normally inoperative, g Y

3. An electric system comprising a nor- The arcs established at both of mally operative arc gap, means for energizing said gap, a. normally inoperative are gap, a translation circuit associated with said normally inoperative arc gap, and

means'for moving the arc at said normally operative arc gap across said normally inoperative arc gap whereby said translation circuit is completed.

4. In an oscillation generating system, a power generator having a frequency-determining circuit, the frequency-determining effect of which is subject to change by reaction from a load circuit and including an electric discharge device, an oscillation system including an electric discharge device with fixed electrodes and having a constant period, and means for keeping said generator system in frequency synchronism with said oscillating system. I

5, In combination, a circuit of variable efi'ective impedance, an oscillator, said oscillator including a dischar e device and a tuned circuit in which oscil ations are produced, said tuned circuit being coupled with said first-named circuit bya coupling ca pable-of transferring energy from either uency osupon the frequency of said generator of variations of resistance in said circuit.

7. A radio telephone system comprising an oscillating arc circuit, modulating appliances for varying in accordance with speech the waves generated by said circuit, said appliances during 0 eration tending to vary the natural perio of sald circuit,

a control are circuit substantially unin- -fluenced by said modula-tlng apphances, and

means whereby said control are circuit tends to maintain constant the frequency of said" oscillating arc circuit. i

8. In combination, an osc llator lncluding a discharge device and a tuned circuit in which said device produces oscillations,

said tuned circuit being coupled to another circuit by a coupling capable of transferring energy from either of said circuits to the other, telephonic apparatus includmg sound translatin the impe ance of said other circuit, and a.

source of constant frequency periodic en v ergy for controlling the frequency of said oscillator.

9. In an arc generator, 8. pair of anodes, a cat ade a nsm t g P means which operates to vary'.

n e ed in shunt-relation to one of said pair of anodes and said cathode, and means for transfer.-

ring the are from one of said anodes to the other.

' 10. In an arc generator, a cathode element,

a pair of normally stationary anode elements cooperating therewith-and means for transferring an are between said elements from one anode to the other;

10 '11.- In an arc generator, a cathode element,

a pair of normally stationary anode elelments cooperating therewith and means for transferringan are between said elements from one anode to the other while maintaining the continuity of the are.

In witness whereof, I hereunto subscribe my name this 28th day of December, A. D., 1916.

RAYMOND LIHEISING. I 

